Light-emitting device, light-emitting apparatus, electronic device, display device, and lighting device

Abstract

A novel light-emitting device, a novel light-emitting apparatus, a novel electronic device, a novel display device, and a novel lighting device which are highly convenient, useful, or reliable are provided. The light-emitting device includes a first electrode, a second electrode, a first layer, and a second layer. The second electrode includes a region overlapping with the first electrode, the first layer includes a region sandwiched between the first electrode and the second electrode, the first layer includes a light-emitting material, the light-emitting material has a function of emitting photoluminescent light in a solution, the photoluminescent light has a first spectrum, the first spectrum has a maximum peak at a wavelength λ1, and the wavelength λ1 is in the range greater than or equal to 440 nm and less than or equal to 470 nm. The second layer includes a region sandwiched between the first layer and the second electrode, the second layer includes a first organic compound, the first organic compound has a first refractive index n1 with respect to light having the wavelength λ1, and the first refractive index n1 is more than or equal to 1.4 and less than or equal to 1.75.

What is claimed is: 
     
         1 . A light-emitting device comprising:
 a first electrode;   a second electrode;   a first layer; and   a second layer,   wherein the second electrode comprises a region overlapping with the first electrode,   wherein the first layer is between the first electrode and the second electrode,   wherein the first layer comprises a light-emitting material,   wherein the light-emitting material is configured to emit photoluminescent light in a solution,   wherein the photoluminescent light has a first spectrum ϕ1,   wherein the first spectrum ϕ1 has a maximum peak at a wavelength λ1,   wherein the wavelength λ1 is in a range greater than or equal to 440 nm and less than or equal to 470 nm,   wherein the second layer is between the first layer and the second electrode,   wherein the second layer comprises a first organic compound,   wherein the first organic compound has a first refractive index n1 with respect to light having the wavelength λ1, and   wherein the first refractive index n1 is more than or equal to 1.4 and less than or equal to 1.75.   
     
     
         2 . The light-emitting device according to  claim 1 ,
 wherein the first spectrum ϕ1 has a full width at half maximum FWHM, and   wherein the full width at half maximum FWHM is greater than or equal to 10 nm and less than or equal to 35 nm.   
     
     
         3 . The light-emitting device according to  claim 1 , wherein the second electrode comprises silver. 
     
     
         4 . The light-emitting device according to  claim 1 , wherein the first organic compound is represented by General Formula (G e1 2): 
       
         
           
           
               
               
           
         
         wherein two or three of Q 1  to Q 3  are each a nitrogen atom, 
         wherein in the case where two of Q 1  to Q 3  each represent a nitrogen atom, the remaining one of Q 1  to Q 3  represents CH, 
         wherein at least one of R 201  to R 215  represents a phenyl group having a substituent, 
         wherein the others of R 201  to R 215  each independently represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, an alicyclic hydrocarbon group having 3 to 10 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms in a ring, and a substituted or unsubstituted pyridyl group, 
         wherein the phenyl group having a substituent has one or two substituents, and 
         wherein the substituents each independently represent any of an alkyl group having 1 to 6 carbon atoms, an alicyclic hydrocarbon group having 3 to 10 carbon atoms, and a substituted or unsubstituted aromatic hydrocarbon group having 6 to 14 carbon atoms in a ring. 
       
     
     
         5 . The light-emitting device according to  claim 4 ,
 wherein the first organic compound comprises sp 3  carbon atoms,   wherein the sp 3  carbon atoms each form a bond with other atoms by sp 3  hybrid orbitals, and   wherein a proportion of the sp 3  carbon atoms in total carbon atoms contained in the first organic compound is higher than or equal to 10% and lower than or equal to 60%.   
     
     
         6 . A light-emitting apparatus comprising:
 the light-emitting device according to  claim 1 ; and   at least one of a transistor and a substrate.   
     
     
         7 . A display device comprising:
 the light-emitting device according to  claim 1 ; and   at least one of a transistor and a substrate.   
     
     
         8 . A lighting device comprising:
 the light-emitting apparatus according to  claim 6 ; and   a housing.   
     
     
         9 . An electronic device comprising:
 the display device according to  claim 7 ; and   at least one of a sensor, an operation button, a speaker, and a microphone.